It creates more problems than it solves. You would need an order of magnitude more processing power to play a game on it. Personally I would prefer 4K at a higher framerate. Even 1080 if it improves response.
Video in 8K are massive. You need better codecs to handle them, and they aren't that widely supported. Storage is more expensive than it was a decade ago.
Also, there is no content. Nobody wants to store and transmit such massive amounts of data over the internet.
HDMI cables will fail sooner at higher resolutions. That 5 year old cable will begin dropping out when you try it at 8k.
4K is barely worth the tradeoffs.